If I had heard someone talking about ML in Javascript a few years ago I would think it was a joke, probably because my professors seem to love to make fun of javascript, PHP.
I wrote a little python script to match the websites with the Alexa Top 1 Million and sort by rank. I found 268 top 1 million sites in the pwned list. You can check out the ranking here if you want https://github.com/tail-recursion/hibp-rankings/. Notable websites include; lotro.com, mtgox.com, malwarebytes.org, daemon-tools.cc, autohotkey.com, vbulletin.org